Clasificaciones 2026

Sistemas de agua menos confiables en Iowa — 2026

Última actualización: 4 de junio de 2026

1,064 códigos postales clasificados por Reliability Score N.º 1: código postal 51540 (Hastings, IA) — 10/100

Out of 1,064 ZIP codes with data in Iowa, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Iowa Rankings

Statistic Value
ZIP codes ranked 1,064
Lowest value 10/100
Median value 75/100
State Iowa

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Reliability Score Safety Score
1 51540 Hastings IA 10/100 47/100
2 50112 Grinnell IA 15/100 36/100
3 52310 Monticello IA 27/100 64/100
4 50557 Lehigh IA 28/100 44/100
5 50464 Plymouth IA 30/100 61/100
6 51451 Lanesboro IA 30/100 50/100
7 50853 Massena IA 34/100 60/100
8 52338 Swisher IA 34/100 65/100
9 50158 Marshalltown IA 35/100 47/100
10 50501 Fort Dodge IA 35/100 35/100
11 50562 Mallard IA 35/100 46/100
12 52251 Ladora IA 35/100 42/100
13 50611 Bristow IA 36/100 55/100
14 50247 State Center IA 40/100 59/100
15 50622 Denver IA 40/100 59/100
16 51440 Dedham IA 40/100 50/100
17 51555 Missouri Valley IA 40/100 46/100
18 51650 Riverton IA 40/100 62/100
19 52208 Belle Plaine IA 40/100 44/100
20 52212 Center Junction IA 40/100 62/100
21 52301 Marengo IA 40/100 50/100
22 52755 Lone Tree IA 40/100 64/100
23 50009 Altoona IA 42/100 65/100
24 52322 Oxford IA 44/100 55/100
25 50005 Albion IA 45/100 64/100
26 50138 Knoxville IA 45/100 59/100
27 50327 Pleasant Hill IA 45/100 55/100
28 50423 Britt IA 45/100 62/100
29 50431 Coulter IA 45/100 64/100
30 50439 Goodell IA 45/100 64/100
31 50449 Klemme IA 45/100 64/100
32 50451 Lakota IA 45/100 64/100
33 50591 Thor IA 45/100 54/100
34 51535 Griswold IA 45/100 61/100
35 51558 Moorhead IA 45/100 58/100
36 51652 Sidney IA 45/100 59/100
37 52203 Amana IA 45/100 66/100
38 52204 Amana IA 45/100 62/100
39 52241 Coralville IA 45/100 52/100
40 52255 Lowden IA 45/100 66/100
41 52333 Solon IA 45/100 63/100
42 52340 Tiffin IA 45/100 66/100
43 52358 West Branch IA 45/100 58/100
44 52359 West Chester IA 45/100 64/100
45 52649 Salem IA 45/100 62/100
46 52726 Blue Grass IA 45/100 68/100
47 52759 Montpelier IA 45/100 53/100
48 50213 Osceola IA 46/100 56/100
49 50128 Jamaica IA 47/100 32/100
50 50140 Lamoni IA 49/100 65/100
51 52411 Cedar Rapids IA 49/100 65/100
52 50002 Adair IA 50/100 56/100
53 50066 Dawson IA 50/100 45/100
54 50130 Jewell IA 50/100 48/100
55 50167 Minburn IA 50/100 64/100
56 50261 Van Meter IA 50/100 68/100
57 50274 Wiota IA 50/100 59/100
58 50434 Fertile IA 50/100 64/100
59 50436 Forest City IA 50/100 68/100
60 50469 Rockwell IA 50/100 64/100
61 50480 Titonka IA 50/100 66/100
62 50484 Woden IA 50/100 61/100
63 50530 Dayton IA 50/100 60/100
64 50552 Knierim IA 50/100 60/100
65 50648 Jesup IA 50/100 63/100
66 50845 Diagonal IA 50/100 59/100
67 51020 Galva IA 50/100 64/100
68 51058 Sutherland IA 50/100 64/100
69 51241 Larchwood IA 50/100 64/100
70 51247 Rock Valley IA 50/100 63/100
71 51545 Little Sioux IA 50/100 65/100
72 51551 Malvern IA 50/100 63/100
73 52001 Dubuque IA 50/100 59/100
74 52002 Dubuque IA 50/100 64/100
75 52003 Dubuque IA 50/100 59/100
76 52004 Dubuque IA 50/100 64/100
77 52099 Dubuque IA 50/100 60/100
78 52215 Chelsea IA 50/100 54/100
79 52240 Iowa City IA 50/100 46/100
80 52242 Iowa City IA 50/100 51/100
81 52243 Iowa City IA 50/100 50/100
82 52244 Iowa City IA 50/100 50/100
83 52245 Iowa City IA 50/100 51/100
84 52246 Iowa City IA 50/100 46/100
85 52247 Kalona IA 50/100 68/100
86 52254 Lost Nation IA 50/100 61/100
87 52550 Delta IA 50/100 64/100
88 52591 Sigourney IA 50/100 64/100
89 52722 Bettendorf IA 50/100 43/100
90 52777 Wheatland IA 50/100 68/100
91 50453 Leland IA 52/100 69/100
92 50541 Gilmore City IA 52/100 65/100
93 52205 Anamosa IA 52/100 61/100
94 52341 Toddville IA 52/100 66/100
95 52761 Muscatine IA 52/100 54/100
96 51454 Manilla IA 53/100 66/100
97 51521 Avoca IA 53/100 61/100
98 52351 Walford IA 53/100 61/100
99 50003 Adel IA 55/100 59/100
100 50029 Bayard IA 55/100 52/100

Methodology

Water system reliability scores (0-100) combine violation frequency, violation recency, resolution rate, and system size. Systems with repeated health-based violations and unresolved issues score lowest. The reliability score focuses specifically on the water utility performance, distinct from the broader Home Safety Score.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What does a low water reliability score mean?

A low reliability score (below 50) indicates a water system with frequent violations, poor resolution rates, or recurring compliance issues. These systems may have aging infrastructure, inadequate treatment, or management challenges.

How is reliability different from safety score?

The reliability score focuses specifically on the water utility performance (violations, resolution, compliance). The Home Safety Score is broader, also including lead risk, radon, and flood data. A ZIP code can have a reliable water system but still have high radon or flood risk.

Explore More Rankings

Cómo se calcula esta clasificación, fuentes de datos y limitaciones: Metodología de clasificaciones →


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Aviso: Las clasificaciones se basan en datos de la EPA, la FEMA y agencias federales. Reflejan patrones históricos e indicadores de riesgo, no necesariamente las condiciones actuales. Para obtener la información más actual, los residentes pueden comunicarse con la compañía local de agua o solicitar un Informe de Confianza del Consumidor (CCR).

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